void main(List<String> args) {
  String name = '温暖的冷锋';
  print(name);
  name = '111';
  print(name);

  print('当前名字：$name');
  print('${name.length}');

//换行
  String poemStr = '白日依山尽\n黄河入海流\n欲穷千里目\n更上一层楼';
  print(poemStr);
//换行
  String song = '''
    Hiding from rain and snow,
    Looking at crowed from our around go
''';
  print(song);
}
